When I entered, I found my father ______ on the sofa and ______ in a magazine.
| A．sitting; absorbed | B．sit; absorb | C．sitting; absorbing | D．sat; absorbed |
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I have no doubt in my mind______ they will be glad to see me.
| A．if | B．whether | C．that | D．about |
Eric received training in computer for one year, _______ he found a job in a big company.
| A．after that | B．after it | C．after which | D．after this |
With the help of high technology, many new substances（物质）______in the past years.
| A．discovered | B．have discovered | C．had been discovered | D．have been discovered |
______ is know to us all, good friends ______ happiness and value to our life.
| A．It; add | B．As; add up | C．It; add up | D．As; add |
ch more _______ in the UK than in the US, where most people have a mailbox instead.相关知识点
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